Adaptive Queue Management Scheme for Flexible Dual TCP/UDP Streaming Protocol

Flexible Dual-TCP/UDP Streaming Protocol (FDSP) is a new method for streaming H.264-encoded High-definition (HD) video over wireless networks. FDSP streaming is done in sequential video segments or chunks called substreams. In FDSP, substream lengths are used to control the amount of Transmission Control Protocol (TCP) data that needs to be sent prior to the playback of that substream. To avoid frequent rebuffering, TCP packets of the next substream are overlapped with the User Datagram Protocol (UDP) packets of the current substream. The TCP threshold parameter determines when to overlap new TCP packets with the current UDP stream. This paper analyzes the TCP threshold parameter in the context of FDSP. Our results show that user Quality of Experience (QoE) can be enhanced by adaptive adjusting of the TCP threshold using the additiveincrease/multiplicative-decrease (AIMD) algorithm based on the UDP packet loss rate and the TCP rebuffering. Keywords–Bitstream Prioritization; HD Video Streaming; Queue Size; TCP Threshold; FDSP.